Air blow gun for chip and debris cleaning

ABSTRACT

An air blow gun for chip and debris cleaning comprises a barrel with a bore at its inner end opening into an enlarged chamber defining a valve seat. A hand grip has a bore joined to said chamber adapted for connection to a source of compressed air. A ball seal nested in said chamber seats on application of air pressure and a trigger operated pin on the barrel is adapted to unseat the ball seal, permitting the flow of compressed air through said barrel.

United States Patent [191 Blatt [111 3,811,622 51 May 21,1974

[ AIR BLOW GUN FOR CHIP AND DEBRIS CLEANING [76] Inventor: Leland F. Blatt, 821 Lakeshore Rd.,

Grosse Pointe Woods, Mich. 48236 [22] Filed: Nov. 6, 1972 [21] Appl. No.: 304,196

52 us. (:1. .Q 239/526 [51] Int. Cl B05b 7/02 [58] Field of Search 239/526, 583, 577

[5 6] References Cited UNITED STATES PATENTS 2,362,946 l 1/1944 Stockdale I. 239/526 X 3,599,876 8/197! Kyburg'.. 3,263,934 8/l966 Hope, Jr. et all 239/586 3,445,069 5/1969 Druge 239/586 Primary ExaminerLloyd L. King Attorney, Agent, or Firm-Cullen, Settle, Sloman & Cantor ABSTRACT An air blow gun for chip and debris cleaning comprises a barrel with a bore at its inner end opening into an enlarged chamber defining a valve seat. A hand grip has a bore joined to said chamber adapted for connection to a source of compressed air. A ball seal nested in said chamber seats on application of air pressure and a trigger operated pin on the barrel is adapted to unseat the ball SeaL'permitting the flow of compressed air through said barrel.

2- Claims, 2 Drawing Figures AIR BLOW GUN FOR CHIP AND DEBRIS CLEANING BACKGROUND OF THE INVENTION Heretofore in machine tool operations or any machining operation, there is often the need of removing accumulated chips and debris from a work area. For

this purpose in most cases, an air hose with a hand valve has its outlet appliedto the site. The difficulty with this conventional use of an air hose is the inconvenience of its use when needed, and the method by which the flow of air may be controlled as desired.

BRIEF DESCRIPTION OF THE-INVENTION It is an object of the present invention to provide an air blow gun adapted for connection to a source of compressed air such as a flexible hose and which has a manually operated trigger for controlling and initiating the flow of compressed air out from the gun barrel.

It is a further object to provide upon the end of said barrel a silencer device for reducing the sound level to below 80 decibels.

These and other objects will be seen from the following specification and claims in conjunction with the appended drawing.

THE DRAWING FIG. 1 is a longitudinal section of the present air blow gun with a connection to a source of compressed air fragmentarily shown and with an air silencer upon the outer end of the gun barrel;

FIG. 2 is an end elevational view of the gun with the silencer removed.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawing, the high volume air blow gun-is adapted for chip and debris cleaning, though not limited thereto as designated at 11, FIG. 1, and includes elongated barrel 13 having a bore 15 terminating in the outlet head 35.

Handle grip 17 is connected to said barrel, being inclined thereto and includes an elongated bore 19, which at its outer end, is adapted for connection to a suitable flexible conduit such as conduit 21, fragmentarily shown for delivering compressed air thereinto.

The barrel bore 15 at its inner end communicates with a high pressure chamber 27 whose inwardly converging wall 23 defines with bore 15 the seat for the .ball .seal 25, normally nested within chamber 27 but adapted for registry with said seat' on application of air under pressure to said chamber for closing off the flow of said air through said barrel.

The outer end of chamber 27 is open to the exterior of the barrel and is closed by the seal plug 29 which icludes 0 ring pressure seal 31 and the retainer ring 33 nested within an undercut annular recess in said barrel, to thus, effectively seal off chamber 27, but provide for communication thereinto.

A suitable sound silencer 37 is mounted over the outlet end 35 of said barrel for the purpose of reducing the sound level to or below 80 DBA with the air pressure applied in the range of 80 PSI.

The construction and detail of said silencer is shown in U.S. Pat. No. 3,698,510 dated Oct. 17, 1972, identified as Safety Silencer Air Nozzle.

The elongated trigger 39 normally spaced forwardly of the handle grip has a bifurcated upper end 41 which is positioned around the depending boss 43 on said barrel and is pivotally connected thereto by pivot pin 45.

Push pin 47 having an enlarged head 49 at its outer end is slidably positioned through a corresponding angular aperture in said boss and barrel. Compression spring 51 is nested within sleeve 53 within said boss and at its outer end, bears against the head of said pin biasing the same outwardly against an inner surface of trigger 39.

The inner end of the push pin 47 with the trigger inactive as shown, is arranged upon the delivery side of the ball check or ball seal 25 and flush with said seat so that upon manual squeezing or movement of the trigger 39 towards said handle grip, will cause said ball seal to unseat such as to the dotted line position shown to permit the passage of controlled compressed air tent, essentially, its elongated housing 55 has its inner end internally threaded for mounting over the head outlet end 35 of the barrel.

Anchored within said hosuing is a cone-shaped porous baffle 59 of sintered carbide, for example, and spaced forwardly thereof, the apertured baffle 63. Interposed between said baffles is a mass of porous filter material 61 which may be of plastic material such as polyurethane, or porous rubber or metal particles, such as wire to deadenand reduce the level of sound of the air passing through housing 55 out through the bellshaped outwardly diverging porous safety bell 65.

A suitable hook 67 is attached to or forms a part of said barrel at its inner end for convenient hanging so as to be available for use as desired.

Having described my invention, reference should now be had to the following claims.

1. A substantially L or pistol-shaped air blow gun comprising an enlarged cylindrical pressure chamber, having a front wall formed with an air outlet opening and a bottom wall formed with an air inlet opening, and a rear wall formed with a rear opening but otherwise closed; and a cap formed to be applied to said rear opening; an enlongated horizontally disposed barrel having its inner rear end opening into the outlet opening in the front wall part of said chamber, and its outer forward end open; a hollow hand grip under and at substantially right angles to said barrel and having its upper inner end opening into the inlet opening in the bottom wall part of said chamber, and its lower outer end open for connection to an air line; with the front wall being of considerably larger diameter than that of the outlet opening, and with the inner rear end of the barrel being of a reduced diameter with respect to said chamber to provide a reduced diameter valve seat in the forward end of said chamber; and a sealing spherical ball of a diameter greater than that of the valve seat but smaller than that of the chamber and the rear opening and of a weight substantial enough to tend to drop away from the front opening, but light enough to be capable of being moved by air pressure in the chamber against the front opening; and loosely disposed in said chamber,

rearward of said seat; a headed push pin in the wall of the chamber under and adjacent said seat, a coil spring nested in the said part of the wall for biasing the pin down and away from the ball seal, and a trigger in the angle between the barrel and hand grip and having an end pivotally mounted on the barrel; and having a part adapted to bear up against the pin to push it upwardly and against a front part of the ball thus to bias the ball rearwardly away from the seat; so that it will expose the outlet opening for air flow over and around the ball and through the opening;

with the air inlet opening of the bottom wall of the chamber being behind the front wall of the chamber so that the sealing ball is between the air inlet opening and the front wall, whereby air in the chamber bears against a rear surface of the ball to bias it forwardly against the seat; and with the push pin positioned to bear against a front surface of the ball to bias it rearwardly when the pin is pushed upwardly; whereby the ball will move away from the outlet opening for air flow around and over the ball and through the opening and whereby when the pin pressure is released, the ball is free to be moved by air pressure towards and against the seat, and close it, and then be held against the seat by the air pressure in the chamber; with means in the chamber, when the ball is admitted thereinto through the rear opening and the cap is applied to the rear opening to close it and lock the ball in the chamber, for preventing the ball from passing through the upper end opening of the hand grip; with the ball loosely disposed in the chamber and biased for moving forwardly towards and sealing the valve seat solely by air pressure therein, when the hand grip trigger is released. 2. An air gun according to claim 1 wherein the means for preventing the ball from passing through the upper end opening of the hand grip comprises a formation of thecap. 

1. A substantially L or pistol-shaped air blow gun comprising an enlarged cylindrical pressure chamber, having a front wall formed with an air outlet opening and a bottom wall formed with an air inlet opening, and a rear wall formed with a rear opening but otherwise closed; and a cap formed to be applied to said rear opening; an enlongated horizontally disposed barrel having its inner rear end opening into the outlet opening in the front wall part of said chamber, and its outer forward end open; a hollow hand grip under and at substantially right angles to said barrel and having its upper inner end opening into the inlet opening in the bottom wall part of said chamber, and its lower outer end open for connection to an air line; with the front wall being of considerably larger diameter than that of the outlet opening, and with the inner rear end of the barrel being of a reduced diameter with respect to said chamber to provide a reduced diameter valve seat in the forward end of said chamber; and a sealing spherical ball of a diameter greater than that of the valve seat but smaller than that of the chamber and the rear opening and of a weight substantial enough to tend to drop away from the front opening, but light enough to be capable of being moved by air pressure in the chamber against the front opening; and loosely disposed in said chamber, rearward of said seat; a headed push pin in the wall of the chamber under and adjacent said seat, a coil spring nested in the said part of the wall for biasing the pin down and away from the ball seal, and a trigger in the angle between the barrel and hand grip and having an end pivotally mounted on the barrel; and having a part adapted to bear up against the pin to push it upwardly and against a front part of the ball thus to bias the ball rearwardly away from the seat; so that it will expose the outlet opening for air flow over and around the ball and through the opening; with the air inlet opening of the bottom wall of the chamber being behind the front wall of the chamber so that the sealing ball is bEtween the air inlet opening and the front wall, whereby air in the chamber bears against a rear surface of the ball to bias it forwardly against the seat; and with the push pin positioned to bear against a front surface of the ball to bias it rearwardly when the pin is pushed upwardly; whereby the ball will move away from the outlet opening for air flow around and over the ball and through the opening and whereby when the pin pressure is released, the ball is free to be moved by air pressure towards and against the seat, and close it, and then be held against the seat by the air pressure in the chamber; with means in the chamber, when the ball is admitted thereinto through the rear opening and the cap is applied to the rear opening to close it and lock the ball in the chamber, for preventing the ball from passing through the upper end opening of the hand grip; with the ball loosely disposed in the chamber and biased for moving forwardly towards and sealing the valve seat solely by air pressure therein, when the hand grip trigger is released.
 2. An air gun according to claim 1 wherein the means for preventing the ball from passing through the upper end opening of the hand grip comprises a formation of the cap. 